Network Reconnaissance in IPv6 Networks
draft-gont-opsec-ipv6-host-scanning-01

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Document Type Active Internet-Draft (individual)
Last updated 2012-07-30
Replaced by rfc7707, draft-ietf-opsec-ipv6-host-scanning
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Operational Security Capabilities for                            F. Gont
IP Network Infrastructure (opsec)                                UK CPNI
Internet-Draft                                             July 19, 2012
Intended status: Informational
Expires: January 20, 2013

                Network Reconnaissance in IPv6 Networks
                 draft-gont-opsec-ipv6-host-scanning-01

Abstract

   IPv6 offers a much larger address space than that of its IPv4
   counterpart.  The standard /64 IPv6 subnets can (in theory)
   accommodate approximately 1.844 * 10^19 hosts, thus resulting in a
   much lower host density (#hosts/#addresses) than their IPv4
   counterparts.  As a result, it is widely assumed that it would take a
   tremendous effort to perform address scanning attacks against IPv6
   networks, and therefore IPv6 address scanning attacks have long been
   considered unfeasible.  This document analyzes how traditional
   address scanning techniques apply to IPv6 networks, and also explores
   a number of techniques that can be employed for IPv6 network
   reconnaissance.

Status of this Memo

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   This Internet-Draft will expire on January 20, 2013.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Gont                    Expires January 20, 2013                [Page 1]
Internet-Draft             IPv6 Reconnaissance                 July 2012

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  IPv6 Address scanning  . . . . . . . . . . . . . . . . . . . .  5
     3.1.  Address configuration in IPv6  . . . . . . . . . . . . . .  5
     3.2.  IPv6 address scanning of remote area networks  . . . . . . 10
     3.3.  IPv6 address scanning of local area networks . . . . . . . 11
     3.4.  Existing IPv6 address scanning tools . . . . . . . . . . . 12
     3.5.  Mitigations  . . . . . . . . . . . . . . . . . . . . . . . 13
   4.  Leveraging DNS reverse mappings for network reconnaissance . . 15
     4.1.  Discussion . . . . . . . . . . . . . . . . . . . . . . . . 15
     4.2.  Mitigations  . . . . . . . . . . . . . . . . . . . . . . . 15
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . . 16
   6.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 17
   7.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 18
     7.1.  Normative References . . . . . . . . . . . . . . . . . . . 18
     7.2.  Informative References . . . . . . . . . . . . . . . . . . 18
   Appendix A.  Implementation of a full-fledged IPv6
                address-scanning tool . . . . . . . . . . . . . . . . 21
     A.1.  Host-probing considerations  . . . . . . . . . . . . . . . 21
     A.2.  Implementation of an IPv6 local address-scanning tool  . . 22
     A.3.  Implementation of a IPv6 remote address-scanning tool  . . 23
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 25

Gont                    Expires January 20, 2013                [Page 2]
Internet-Draft             IPv6 Reconnaissance                 July 2012

1.  Disclaimer

   Prior work such as [RFC5157] and [V6-WORMS] still needs to be
   incorporated into this document.  My logies -- the next rev will
   address this.

   My understanding is that some alternative network reconnaissance
   techniques (DNS-based?) developed by Marc Heuse still need to be
   incorporated -- hopefully the next rev will address this, too.

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